Mesh Not working?

Hi! By the picture you shared i can tell you that this is a meshgroup/cuts issue. The basic premise on how to properly import back into Studio is to keep the same amount of meshgroups with their respective cut numbers. So, either re clone the item and export the original blend file or open it if you already have it. Then compare both the original and your edit to see if you have the same amount of meshgroups and that the cut numbers match.